SITE INFORMATION AND CORRESPONDENCE

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APPENDIX A - REPORTING 30 August 1991 e.g., Pump and aerate, spray, pond, RECOMMENDED MINIMUM thermal incineration, Granulated VERIFICATION ANALYSES (MVA) Activated Charcoal filtration, etc. - Proposed discharge, e.g., sewer, Verification analyses for organic chemicals are storm drain, surface water, land, conducted in laboratories certified by the reinjection, etc. California Department of Health Services. The - Permits required with time MVA are based upon the organic chemicals schedule for application and and mixtures known to be found in under- turnaround time ground tanks, but are not all inclusive; there- - Feasibility studies conducted with fore, they tend to have abroad scope. Labora- results tabulated tory analyses are needed to determine what - Calculations used to determine the substance (qualitative) and how much (quanti- efficacy of the system submitted tative) is present in soil and ground water. for verification The analyses help determine the lateral and vertical extent of contamination ("zero"line") Security/Safety measures for excavation which is used to develop an efficient and cost on-site, contaminated soil piles, pumps effective remediation process. More critically, and treatment systems. analyses determine whether remediation is satisfactory (low level analyses required) and Discussion of FRP the site "cleaned' and stabilized. To determine that the laboratory is providing • After approval of the Plan and time schedule, satisfactory service, the in Quality Assur_ work may proceed. Should delays occur or ance/Quality Control (QA/QC)plans for the extensions of the time schedule be needed, laboratory must be considered. Quality Assur- such requests, with supporting documentation, ance includes the policies which direct the are to be made by letter to the Regional Board laboratory. Quality Control is the physical and LIA. Quarterly reporting will continue. processing of the sample and is critical for precise and accurate analyses. Precision and accuracy, paramount to analytical work, are Closure increased by improved by QA/QC; however, Upon successful completion of the FRP activi- analytical costs also may increase. ties, and a petition by the tank owner, a letter The costlanalysis table below shows cost will be prepared by the Regional Board de- ranges for laboratories with offices in Califor- scribing regulatory conditions of concern to nia, but is not correlated to QA/QC. Based on the Regional Board or LIA, such as deed Regional Board experience, some of our con- restrictions, long term monitoring, alternative sistently accurate laboratories with good drinking water sources, etc. The letter also QA/QC have analytical charges at or near the will certify or confirm the conditions remain- average cost for the analyses listed. Over the ing at the site. past four years average costs have increased about three dollars ($3.00) for BTX&E and TPH-Gasoline, but have decreased eleven dollars ($11.00) for TPH-Diesel in soils while QA/QC generally has improved. • A-14